Psvane 6SN7's. Buy the best they make. Long break in but one of the best new production tubes out there.
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As they are significantly larger than the typical 6SN7, I'd confirm the Psvane tubes will fit in your amplifier. The same holds true for the Shuguang Treasure series.
If you need to look elsewhere for a lower cost tube, consider Raytheon or NOS metal base Shuguang 6N8P, the latter are one of the better buys in tubes.